Issues

• Maintenance: drop support for Python 3.10 on February 1, 2027

  documentationinternal
  aws-powertools/powertools-lambda-python#8735 · Filter by author leandrodamascena opened on Nov 1, 2026

• Docs: IdempotencyConfig docstring says local_cache_max_items defaults to 1024, it is 256

  documentationgood first issuehelp wantedidempotency
  aws-powertools/powertools-lambda-python#8729 · Filter by author leandrodamascena opened on Oct 31, 2026 · 3.41.0
  3

  

• Bug: POWERTOOLS_IDEMPOTENCY_DISABLED set to an empty or non-boolean value crashes every invocation

  buggood first issuehelp wantedidempotency
  aws-powertools/powertools-lambda-python#8728 · Filter by author leandrodamascena opened on Oct 31, 2026 · 3.41.0
  4

  

• Bug: Redis layer fails the invocation instead of retrying when a record expires between SET NX and GET

  buggood first issuehelp wantedidempotency
  aws-powertools/powertools-lambda-python#8727 · Filter by author leandrodamascena opened on Oct 31, 2026 · 3.41.0
  3

  

• Bug: Redis orphan lock timeout ignores expires_after_seconds and is always 10 seconds

  buggood first issuehelp wantedidempotency
  aws-powertools/powertools-lambda-python#8726 · Filter by author leandrodamascena opened on Oct 31, 2026 · 3.41.0
  3

  

• Bug: idempotency payloads with set, frozenset or bytes fields cannot be hashed

  buggood first issuehelp wantedidempotency
  aws-powertools/powertools-lambda-python#8725 · Filter by author leandrodamascena opened on Oct 31, 2026 · 3.41.0
  3

  

• Bug: with a DynamoDB composite key, DataRecord.idempotency_key is the static partition key value

  buggood first issuehelp wantedidempotency
  aws-powertools/powertools-lambda-python#8724 · Filter by author leandrodamascena opened on Oct 31, 2026 · 3.41.0
  3

  

• Bug: DataclassSerializer cannot save datetime/UUID fields and does not rebuild nested dataclasses on replay

  buggood first issuehelp wantedidempotency
  aws-powertools/powertools-lambda-python#8723 · Filter by author leandrodamascena opened on Oct 31, 2026 · 3.41.0
  5

  

• Bug: output_serializer=PydanticSerializer crashes at import under from __future__ import annotations

  buggood first issuehelp wantedidempotency
  aws-powertools/powertools-lambda-python#8722 · Filter by author leandrodamascena opened on Oct 31, 2026 · 3.41.0
  6

  

• Bug: a result that is not JSON serializable leaves the idempotency record stuck as INPROGRESS

  buggood first issuehelp wantedidempotency
  aws-powertools/powertools-lambda-python#8721 · Filter by author leandrodamascena opened on Oct 31, 2026 · 3.41.0
  3

  

• Bug: AppSync identity from a Lambda authorizer (AWS_LAMBDA) is wrapped in AppSyncIdentityIAM

  bugevent_sourcesgood first issuehelp wanted
  aws-powertools/powertools-lambda-python#8718 · Filter by author leandrodamascena opened on Oct 31, 2026 · 3.40.0
  3

  

• Bug: TransferFamilyAuthorizer.password raises KeyError when the event has no password

  bugevent_sources
  aws-powertools/powertools-lambda-python#8714 · Filter by author anishmehta24 opened on Oct 30, 2026 · 3.40.0
  1

  

• Bug: SQSMessageAttribute.binary_value raises KeyError for String attributes

  bugevent_sources
  aws-powertools/powertools-lambda-python#8712 · Filter by author anishmehta24 opened on Oct 30, 2026 · 3.40.0
  1

  

• Bug: compressed routes do not send Vary: Accept-Encoding

  bugevent_handlers
  aws-powertools/powertools-lambda-python#8710 · Filter by author anishmehta24 opened on Oct 30, 2026 · 3.40.0
  1

  

• Bug: Cookie with SameSite.DEFAULT_MODE sends an empty SameSite= attribute

  bugevent_handlers
  aws-powertools/powertools-lambda-python#8708 · Filter by author anishmehta24 opened on Oct 30, 2026 · 3.40.0
  1

  

• Bug: SCHEDULE_BETWEEN_DAYS_OF_WEEK stops matching when LC_TIME is not English

  bugfeature_flags
  aws-powertools/powertools-lambda-python#8706 · Filter by author anishmehta24 opened on Oct 30, 2026 · 3.40.0
  3

  

• Docs: AppSync identity docstring says OPENID_CONNECT returns None, but the dispatch has no such path

  documentation
  aws-powertools/powertools-lambda-python#8704 · Filter by author ShussMiao opened on Oct 30, 2026 · 3.40.0
  2

  

• Bug: idempotent functions return None on replay when the stored response is falsy (0, False, "", [], {})

  bugidempotency
  aws-powertools/powertools-lambda-python#8700 · Filter by author thebadalov opened on Oct 29, 2026 · 3.40.0
  3

  

• Bug: ConsumerRecordRecords.key returns None when record key is an empty string

  bugevent_sources
  aws-powertools/powertools-lambda-python#8696 · Filter by author ASHMEET555 opened on Oct 28, 2026 · 3.40.0
  3

  

• Bug: CloudWatchLogsEnvelope raises ValidationError on non-JSON logEvents[*].message (e.g. Lambda START/END/REPORT)

  bugparser
  aws-powertools/powertools-lambda-python#8695 · Filter by author hidingmyname opened on Oct 28, 2026 · 3.40.0
  4

• Docs: show how Logger and Metrics telemetry appears in CloudWatch Omni

  documentationloggermetricstriage
  aws-powertools/powertools-lambda-python#8692 · Filter by author leandrodamascena opened on Oct 28, 2026

• Bug: data masking prepare_data leaves dataclasses and Pydantic models unconverted

  aws-powertools/powertools-lambda-python#8672 · Filter by author LemonCondor opened on Oct 26, 2026

• Bug: Cookie Expires labels a non-UTC aware datetime as GMT without converting it

  bugevent_handlers
  aws-powertools/powertools-lambda-python#8671 · Filter by author LemonCondor opened on Oct 26, 2026 · 3.40.0
  3

  

• Bug: POWERTOOLS_METRICS_DISABLED is ignored by single_metric, the cold start metric, add_metric auto-flush and Datadog's lambda_metric

  bugmetrics
  aws-powertools/powertools-lambda-python#8667 · Filter by author soujasK opened on Oct 25, 2026 · 3.40.0
  2

  

• Bug: Kafka ProtobufDeserializer reads Confluent message indexes as plain varints, dropping fields or failing for non-first message types

  bugevent_sources
  aws-powertools/powertools-lambda-python#8665 · Filter by author alphasafal opened on Oct 25, 2026 · 3.40.0
  4